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Ultrasonic characterisation of elastic material using the analysis of time-frequency of Wigner-Ville Caracterisation ultrasonore d'un materiau élastique à partir de l'analyse de l'image temps-fréquence de Wigner–Ville

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Spectral analysis is a powerful tool for processing stationary signals. When applied to transient phenomena or non stationary signals, the time-frequency methods (Wigner–Ville distribution, Wavelts or Spectrograms) have certain advantages. This paper presents methods of using the Wigner–Ville transform for the characterization of the bachscattered acoustic signals by an elastic tube. In this article, the time-frequency representation of Wigner–Ville is used to analyse the experimental acoustic signal backscattered by a thin elastic tube of radii ratio equal to 0.9. The characterization of the material elastic (tube) can be done on the basis of its reduced cut-off frequencies of circonferential waves propagating around the tube and of its transversal and longitudinal velocities calculated from the circumferential wave. The time-frequency analysis allows to determine the cut-off frequency of the antisymmetric 1 and the symmetric 1 circumferential waves. The transversal and longitudianl velocities of aluminum estimated from the time-frequency image of Wigner–Ville are in good agreement with those measured by the classic experimental methods given in the scientific literature.

French
L'analyse spectrale est un outil puissant pour le traitement de signaux stationnaires. Lorsque les signaux sont transitoires ou non-stationnaire les méthodes temps-fréquence (Distribution de Wigner–Ville, Ondelettes ou Spectrogrames) sont plus intéressantes. Ce papier présente des méthodes d'utilisation de la transformée de Wigner—Ville pour la caractérisation des signaux acoustiques rétrodiffusés par un tube élastique. Dans cet article, la représentation temps-fréquence de Wigner–Ville est utilisée pour analyser le signal expérimental acoustique rétrodiffuswpá r un tube mince élastique de rapport des rayons égale 0.9. La caractéerisation d'un matériau élastique (tube) peut se faire à partir des fréquences de coupure des ondes circonfŕrentielles se propageant autour de la circonférence du tube et de la vitesse longitudinale et de la vitesse transversale de l'onde circonférentielle. L'analyse temps-fréequence permet de déterminer la fréquence réduite de coupure des ondes circonférentielles antisymétrique A1 et symétrique S1. La vitesse longitudinale et de la vitesse transversale de l'aluminium estimées à partir de l'image temps-fréquence de Wigner–Ville sont en bon accord avec celles mesurées par des méthodes classiques expérimentales données dans la littérature scientifique.
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Language: French

Document Type: Research Article

Publication date: March 1, 2003

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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